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Draft Supplemental Environmental Impact Report Page IV.H-9 Forward Inc. Landfill 2018 Expansion Project identified as"Change Existing+Project+Cum from Existing";"Change 2035 Cum NP from Existing NP";and "Change 2035+Project from Existing NP"). The table shows that the noise levels would increase in 2036 by a significant amount (compared to the existing levels)before addition of the noise from the increased project truck traffic.The additional truck traffic noise that would be associated with the proposed project would further increase traffic noise and contribute to a significant cumulative noise impact. ' Sound barriers are not feasible in the semi-rural areas that would be affected by cumulative traffic increases,because the barriers would be far removed from the activity areas of sensitive receptors and the sound barriers would generally be an unnatural barrier not only to noise but also to distant views now possible in these areas. Thus,no mitigations are available for this cumulative impact other than reducing project operations. ' The project would contribute to a cumulatively significant and unmitigable increase in air pollutant emissions. The proposed project would have a less than ' significant(project-level)impact on ozone impacts (after implementation of Mitigation Measures IV.D-2a and D-2b). However, cumulative projects within the project vicinity would potentially result in a significant impact for ozone. The residual emissions from the project(emissions after mitigation and emissions from the extended years of landfill operations, and increased daily acceptance rate [above existing actual emissions], as a result of the project)would contribute to the overall ozone impact in the region. With Mitigation Measure IV.D-2a and D-2b, the impacts of PM,o from the project individually would be less than significant. However,the project would add to the cumulatively significant impact for particulate matter within the project vicinity. Because the project would result in PM,o emissions from traffic and operations every day (due to the extended years of landfill operations as a result of the project),the project contribution would be cumulatively considerable. No cumulatively potentially significant impacts were identified for the following topics: Public Health and Safety, Hydrology and Water Quality,Soils and Geology,Vegetation and Wildlife,Public Services and Utilities, Cultural Resources, and Visual Quality. H. Significant Unavoidable Adverse Impacts After mitigation,project implementation would have the following unavoidable significant adverse impacts: • Project traffic would contribute to unacceptable Levels of Service at the following intersections under 2035 cumulative conditions: o SR 99 SB On-off Ramps &E. French Camp Rd., (AM and PM peak hours) o SR 99 Urban Interchange&Arch Rd. (AM and PM peak hours) o SR 99 SB On-off Ramps &Mariposa Rd. (AM and PM peak hours) o SR 99 NB On-off Ramps &Mariposa Rd. (PM peak hour) 1